Technically yes, but I wonder if that is wise? Is there a reason shower sumps are plumbed out above the water line? Since the shower pan drain is lower than the thru-hull, that could be another failure point since you might want the sink drain active but not the shower when underway and healing. Hmmmm. Not sure but my gut says that may not be a good idea either.

Sapperwhite, have you seen any issues when underway and the sink drain open? I would worry about that being a ingress point if the shower pan was lower than the seacock, even with a long service loop of hose. I guess you can cap off the old thru-hole.

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